Cleanup namespace usage in public/platform/{Web[P-W]*,linux/*}.h

public/platform/WebSocketHandshakeRequestInfo.h

Index: public/platform/WebSocketHandshakeRequestInfo.h
diff --git a/public/platform/WebSocketHandshakeRequestInfo.h b/public/platform/WebSocketHandshakeRequestInfo.h
index 9b273d9f1007110a922da3027175779e3483da8b..0ab3a9a46edfd51ccad7e2531cdc952e32141fa1 100644
--- a/public/platform/WebSocketHandshakeRequestInfo.h
+++ b/public/platform/WebSocketHandshakeRequestInfo.h
@@ -36,12 +36,9 @@
 #include "public/platform/WebPrivatePtr.h"
 
 namespace blink {
-class WebSocketHandshakeRequest;
-} // namespace blink
-
-namespace blink {
 
 class WebString;
+class WebSocketHandshakeRequest;
 class WebURL;
 
 class WebSocketHandshakeRequestInfo : public WebNonCopyable {
@@ -54,11 +51,11 @@ public:
     BLINK_PLATFORM_EXPORT void setHeadersText(const WebString&);
 
 #if INSIDE_BLINK
-    BLINK_PLATFORM_EXPORT const blink::WebSocketHandshakeRequest& toCoreRequest() const { return *m_private.get(); }
+    BLINK_PLATFORM_EXPORT const WebSocketHandshakeRequest& toCoreRequest() const { return *m_private.get(); }
 #endif // INSIDE_BLINK
 
 private:
-    WebPrivatePtr<blink::WebSocketHandshakeRequest> m_private;
+    WebPrivatePtr<WebSocketHandshakeRequest> m_private;
 };
 
 } // namespace blink